My WebLink
|
Help
|
About
|
Sign Out
Home
Browse
Search
REP08531
DRMS
>
Back File Migration
>
Report
>
REP08531
Metadata
Thumbnails
Annotations
Entry Properties
Last modified
8/24/2016 11:38:23 PM
Creation date
11/26/2007 11:54:32 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1980007
IBM Index Class Name
Report
Doc Name
HISTORIC RECORD STUDY AREA VEGETATION AND PRECIPITATION CHARACTERIZATION 1997 WEST ELK MINE SOMERSET
Permit Index Doc Type
REVEG MONITORING REPORT
Media Type
D
Archive
No
There are no annotations on this page.
Document management portal powered by Laserfiche WebLink 9 © 1998-2015
Laserfiche.
All rights reserved.
/
28
PDF
Print
Pages to print
Enter page numbers and/or page ranges separated by commas. For example, 1,3,5-12.
After downloading, print the document using a PDF reader (e.g. Adobe Reader).
View images
View plain text
species was and continues to be Bromus inermis for all years sampled. Four plant <br />species (Agropyrnn smithii, Bromus inermis, Poa pratensis, and Conwlvulus arvensis) <br />were found to be dominant or major components of each community during all years <br />sampled. Two species, Bromus inermis and Convolvulus arrt?nsis are present in both <br />the dry meadow reference area and the historic record vegetation community in <br />approximately the same relative percentages over the years sampled. Relative cover of <br />plant species in the sampled communities correlated well with the amount of "pre- <br />growing season" precipitation received. <br />Herbaceous production in the communities sampled showed a general correlation with <br />"pre-growing season" precipitation. In the historic record vegetation community, <br />precipitation increased 43.3 percent between 1996 and 1997, and herbaceous <br />production increased 44.8 percent during the same period. Interestingly, the same <br />correlation cannot be made for the 1982 and 1995 dry meadow reference area. The <br />increase in "pre-growing season" precipitation amounts between 1982 and 1995 was <br />24.6 percent, yet herbaceous production dropped 5.3 percent. This does not represent <br />the generally observed relationship, and it is hypothesized that this anomalous <br />observation is related to sampling technique differences. <br />Table 7 provides a comparison of species numbers from three herbaceous communities <br />at the West Elk Mine. In 1982, a "normal" precipitation year, total species numbers at <br />the dry meadow vegetation community and the dry meadow reference area were 13 and <br />15 respectively. In L995, a wet year with 14,23 inches of "pre-growing season" <br />precipitation, species numbers at the dry meadow reference area increased to 2l. <br />Species numbers were the lowest (siz) in the historic record vegetation community in <br />1996, corcesponding with a yeaz with "pre-growing season" precipitation 32 percent <br />below the mean. With increased precipitation in 1997, the historic record vegetation _, <br />community rebounded in species numbers to l5, equivalent in value to species numbers <br />from the dry meadow community and dry meadow reference area in the "normal" <br />precipitation yeaz of 1982. As was observed in 1996 and 1997 in the historic record <br />vegetation community, numbers of fort species increased greatly in the wet year 1995 <br />at the dry meadow reference area when compared to the normal precipitation year of <br />1982. It is deduced that with increased precipitation prior to the growing season, <br />numerous opportunistic cool season species germinate, flower, and reproduce during <br />the favorable normal and wet years, while remaining dormant during the unfavorable <br />dry years. Presumably, this relates to their ability to compete with the dominant and <br />more aggressive graminoids during unfavorable conditions. <br />Figure 4 depicts the relationship between total vegetation cover and total herbaceous <br />production and "pre-growing season" precipitation in the historic record vegetation <br />community (HANG), the dry meadow community (DM) and the dry meadow reference <br />area (DMRA). The four years of data from the three communities illustrate distinct <br />relationships directly related to"pre-growing season "precipitation. <br />-11- <br />
The URL can be used to link to this page
Your browser does not support the video tag.